Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is caused by the deficiency of

Options

A. N, K, Mg
B. S, Fe, Zn
C. Mn, Mo, Mg
D. all of these

Explanation

To answer the question about the cause of chlorosis, which is the loss of chlorophyll leading to yellowing in leaves, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chlorosis**: Chlorosis refers to the yellowing of leaves due to the loss of chlorophyll, the green pigment essential for photosynthesis in plants.

2. **Identifying Essential Elements**: Several essential elements are crucial for the formation and maintenance of chlorophyll in plants. These include:
- Magnesium
- Iron
- Manganese
- Zinc
- Sulfur
- Potassium
- Nitrogen
- Molybdenum

3. **Recognizing Deficiencies**: A deficiency in any of these essential elements can lead to chlorosis. When plants lack these nutrients, they cannot produce sufficient chlorophyll, resulting in yellowing leaves.

4. **Analyzing the Options**: The question provides multiple options, each containing different elements. We need to determine which of these elements, when deficient, can lead to chlorosis:
- Option 1: Nitrogen, Potassium, Magnesium
- Option 2: Sulfur, Iron, Zinc
- Option 3: Manganese, Molybdenum, Magnesium

5. **Conclusion**: Since all the elements mentioned in the options are essential for chlorophyll production, a deficiency in any of them can cause chlorosis. Therefore, the correct answer is that chlorosis can be caused by the deficiency of any of these elements.

### Final Answer:
Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is caused by the deficiency of **any of the essential elements listed** (Nitrogen, Potassium, Magnesium, Sulfur, Iron, Zinc, Manganese, Molybdenum).

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